Former campaign adviser Roger Stone says the downfall of President Donald Trump is inevitable and is already planning to profit off the collapse with a book deal, according to a salacious new report from Vanity Fair.

Stone predicts that Robert Mueller's investigation will lead to charges, not necessarily related to the possible collusion with Russian officials, as has been suggested by some.

"It's painfully obvious Mueller will bring charges," Stone said, according to the report.

"The theory is Mueller will indict him on some process-related matter," Stone added, suggesting obstruction of justice. "The only people who don’t seem to know it are Ty Cobb, [John] Dowd, and the president."

Other Trump allies have suggested Mueller's probe could lead to Trump's undoing.

Last week, Chris Ruddy, the CEO of conservative Newsmax Media, said Mueller's investigation poses an "existential threat" -- especially given the speed with which his probe has gone.

"He’s gotten four major — two convictions, two plea agreements," Ruddy said. "Lightning speed. I mean, during the Clinton years, it took Ken Starr and Robert Fisk four years.”

The comments come as Deputy Attorney General Rod Rosenstein, who appointed Mueller to his role, defended the team and its investigation on Capitol Hill after reports emerged that two agents who once worked with Mueller had exchanged anti-Trump text messages.

Stone also believes that allegedly "disloyal" members of the Trump Cabinet could play a key role in his removal from office, according to Vanity Fair.

"Nikki Haley stuck a knife in his back," Stone said of U.N. Ambassador Nikki Haley, a reference to Haley's Sunday remarks in which she suggested that all those who've accused Trump of sexual misconduct and harassment should at least be heard, as she generally applauded a flurry of women who've come forward with allegations against many different high-profile men.

"Women who accuse anyone should be heard," Haley said. "They should be heard and they should be dealt with, and I think we heard them prior to the election. I think any woman who has felt violated or felt mistreated in any way - they have every right to speak up."

Stone worries that she and many other members of the Trump Cabinet would turn on him if the 25th Amendment were to be invoked. Section IV of the amendment allows the vice president and a majority of cabinet members to remove the president from office. Stone believes only two current members of the cabinet would definitely vote against such a move.

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Women who've accused Trump of sexual assault and harassment

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Women who've accused Trump of sexual assault and harassment

Rachel Crooks, a former receptionist in Trump Tower in 2005, attends a news conference for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly

(L-R) Rachel Crooks, a former receptionist in Trump Tower in 2005, Jessica Leeds and Samantha Holvey, a former Miss North Carolina, exit a news conference for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY

Jessica Leeds attends a news conference for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly

TORONTO, ON - JANUARY 18 - Journalist Natasha Stoynoff poses at the Simon & Schuster offices in downtown Toronto, January 18, 2017. Stoynoff, who spoke out during the election campaign about being sexually attacked by Donald Trump when she was a writer at People magazine. (Andrew Francis Wallace/Toronto Star via Getty Images)

WASHINGTON, DC - JANUARY 21: Jessica Drake and Temple Taggart during the Accusers of President Donald Trump Hold Press Conference With Attorney Gloria Allred At The Women's March In Washington on January 21, 2017 in Washington, DC. (Photo by Mike Coppola/Getty Images)

Samantha Holvey, a former Miss North Carolina, speaks at a news conference for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly

Summer Zervos, a former contestant on The Apprentice, leaves New York State Supreme Court with attorney Gloria Allred (R) after a hearing on the defamation case against U.S. President Donald Trump in Manhattan, New York City, U.S., December 5, 2017. REUTERS/Andrew Kelly

Summer Zervos, a former contestant on The Apprentice, appears in New York State Supreme Court during a hearing on a defamation case against U.S. President Donald Trump in Manhattan, New York, U.S., December 5, 2017. REUTERS/Barry Williams/Pool

Summer Zervos, a former contestant on The Apprentice, leaves New York State Supreme Court with attorney Gloria Allred (L) after a hearing on the defamation case against U.S. President Donald Trump in Manhattan, New York City, U.S., December 5, 2017. REUTERS/Andrew Kelly

(L-R) Rachel Crooks, a former receptionist in Trump Tower in 2005, Jessica Leeds, Samantha Holvey, a former Miss North Carolina and Brave New Films founder Robert Greenwald, attend a news conferences for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly

(L-R) Rachel Crooks, a former receptionist in Trump Tower in 2005, Jessica Leeds and Samantha Holvey, a former Miss North Carolina, attend a news conference for the film "16 Women and Donald Trump" which focuses on women who have publicly accused President Trump of sexual misconduct, in Manhattan, New York, U.S., December 11, 2017. REUTERS/Andrew Kelly